public class Example4_5 {
       	public static void main(String args[]) {
        Rect ractangle = new Rect();
       	ractangle.width = 109.87;
       	ractangle.height = 25.18;
        double area = ractangle.getArea();					        System.out.println("矩形的面积:"+area);					        Lader lader = new Lader();	               
       	lader.above = 10.798;						
	lader.bottom = 156.65;	      
	lader.height = 18.12;					
	area = lader.getArea();					
	System.out.println("梯形的面积:"+area);
	}
}


